61072421 has 2 divisors, whose sum is σ = 61072422. Its totient is φ = 61072420.

The previous prime is 61072399. The next prime is 61072433. The reversal of 61072421 is 12427016.

61072421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59459521 + 1612900 = 7711^2 + 1270^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61072421 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61072321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30536210 + 30536211.

It is an arithmetic number, because the mean of its divisors is an integer number (30536211).

Almost surely, 2^61072421 is an apocalyptic number.

It is an amenable number.

61072421 is a deficient number, since it is larger than the sum of its proper divisors (1).

61072421 is an equidigital number, since it uses as much as digits as its factorization.

61072421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 61072421 is about 7814.8845800818. The cubic root of 61072421 is about 393.8054408875.

Adding to 61072421 its reverse (12427016), we get a palindrome (73499437).

The spelling of 61072421 in words is "sixty-one million, seventy-two thousand, four hundred twenty-one".